### Relevant Articles: - [Guide to the System Rules Library](https://www.baeldung.com/java-system-rules-junit) - [Guide to the System Stubs Library](https://www.baeldung.com/java-system-stubs) - [Code Coverage with SonarQube and JaCoCo](https://www.baeldung.com/sonarqube-jacoco-code-coverage) - [Exclusions from Jacoco Report](https://www.baeldung.com/jacoco-report-exclude) - [Gray Box Testing Using the OAT Technique](https://www.baeldung.com/java-gray-box-orthogonal-array-testing) - [Unit Testing of System.in With JUnit](https://www.baeldung.com/java-junit-testing-system-in) - [Fail Maven Build if JUnit Coverage Falls Below Certain Threshold](https://www.baeldung.com/maven-junit-fail-build-coverage-threshold)